I cloroplasti svolgono la fotosintesi clorofialiana ; nei mitocondri, invece, avviene la respirazione cellullare.

I batteri sono cellule procariote; queste cellule sono prive di membrana cellulare e possono vivere anche negli ambienti più estremi.

La parte fluida del citoplasma, il citosol, è una soluzione di ioni, piccole molecole e grosse proteine; nelle cellule eucariote metà del citoplasma è costituito da piccole strutture chiamate organuli.

Tutte le cellule sono rivestite da una membrana cellulare, formata da un doppio strato fosfolipidico; le cellule vegetali hanno anche una parete rigida costituita da cellulosa.

Le cellule Eucariote: hanno dimensioni limitate per favorire il rapporto superficie/volume e rendere le cellule metabolicamente attive.

Il nucleo, avvolto da una doppia membrana dotata di pori per poter comunicare col citoplasma, contiene il DNA sotto forma di cromatina e un nucleolo che assembla i ribosomi.

Il citoscheletro mantiene la forma della cellula, fissa gli organuli, dirige il traffico interno e le consente di muoversi; è formato da filamenti di actina, microtubuli e filamenti intermedi.

Ciglia e flagelli sono formati da filamenti proteici; servono per il movimento.

Il vacuolo è una cavità citoplasmatica contenente acqua e soluti, delimitata da una membrana; le vescicole con funzione di trasporto, sono piccole e hanno una struttura uguale al vacuolo

Il reticolo endoplasmatico è costituito da un sistema di membrane; il reticolo rugoso ricoperto di ribosomi da ribosomi sintetizza le proteine e il reticolo liscio sintetizza soppratutto lipidi.

I lisosomi sono vescicole che racchiudono gli enzimi coinvolti nelle reazioni di idrolisi, i proteasomi sono specializzati nel demolire proteine per riciclare amminoacidi, i perossisomi contengono diversi enzimi ossidativi.

I ribosomi sono sono siti presso cui vengono assemblati gli amminoacidi per la sintesi delle proteine.

L'apparato di golgi è un centro di elaborazione di molecole complesse che vengono poi avvolte in vescicole e trattenute nella cellula stessa o esportate.

The way I look at the world, if you can't find a way to get something good out of the experience, then you have lived an unhappy life. All the actors I have worked with, superstars or otherwise, I have enjoyed.

The fundamental job of a toddler is to rule the universe.

It is not good to demonstrate your luxury and your wealth: to rub it in the faces of others is insulting. So you should be modest; try not to insult people by showing that you can do what they cannot.

My wife can see always how a part affects me personally because she has to live with it.

The soul, fortunately, has an interpreter - often an unconscious, but still a truthful interpreter - in the eye.

It would have been very easy for me to put on a little tight skirt and go out and try what I always call the 'Barbie doll' roles.

And if thought and emotion can persist in this way so long after the brain that sent them forth has crumpled into dust, how vitally important it must be to control their very birth in the heart, and guard them with the keenest possible restraint.

When I was younger, I was a bit of a feisty fighter type of guy. That's something my father told me as I was becoming a man: 'You don't go picking fights, but you don't run from any of them.' And I was more afraid of my father than anybody else I had to fight.

If every human being disappeared off the face of the earth in an instant, the earth would still keep spinning and the planet would develop new life forms.

I love the irony. I'm perceived as being really young and yet I have the clinical condition of an old man.

So long as I'm Commander-in-Chief, we will sustain the strongest military the world has ever known. When you take off the uniform, we will serve you as well as you've served us - because no one who fights for this country should have to fight for a job, or a roof over their head, or the care that they need when they come home.

I'm kind of proud of being a love child.

You prepare. You study. You've got to be ready for anything.

The natural evolution of a well-educated populus is integration. And this is not political; it's not theoretical; it's not even partisan.

In my long innings, I have seen many sunrises and many sunsets; many good and bad times.

An once of hypocrisy is worth a pound of ambition.

Whoever said the pen is mightier than the sword obviously never encountered automatic weapons

My name is Harvey Milk and I'm here to recruit you.

The theory of permanent Muslim-Christian enmity, though it flourishes in the caves of Tora Bora and parts of the American academy, was long ago exploded by the historians.

There are lots of people who believe that caricature of me the tabloids created, so they think they don't like me.

A lonely night is more profound then lonesome nights.

A game is like a mirror that allows you to look at yourself.

The writing I love has something memorable in it - an image, a smell. It's the connection between the moment and the whole concept, weaving the micro together with the macro so that it has a hold on people - that's writing.

I owe a great debt to motor-racing, and the first place I went to in Europe when I was 20 was Italy, and I was extremely influenced by it in books until I got there.